Refractive index and absorption of lead bromide crystals

• Published in: Materials research bulletin 2000-02, Vol.35 (3), p.471-476
• Main Authors: Ren, Q, Liu, L.Q, Wang, Z.G, An, X.S, Zhang, G.H, Xu, D
• Format: Article
• Language: English
• Subjects: A. Optical materials; B. Crystal growth; Condensed matter: electronic structure, electrical, magnetic, and optical properties; D. Optical properties; Exact sciences and technology; Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity); Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/S0025-5408(00)00229-4

Lead bromide (PbBr 2) crystals in [001] orientation were obtained by the Bridgman growth method. The orientation of the principal refractive axes of the crystals was determined, and their principal refractive indices were measured by the least deviation angle at eight selected wavelengths. The optical axial angle and the dispersion of refractive index in the visible spectral range were calculated by Sellmeier’s formula. Optical transmission and reflection spectra were measured and the absorption coefficient α was determined. Using the calculated α(hν) dependence, the bandgap width corresponding to indirect transition was determined.